/* ==========================================================================
   Quantum Multiscale (Q-MS) — design system
   ========================================================================== */

:root {
  --navy:      #01162b;
  --navy-2:    #062546;
  --navy-3:    #0a3a6b;
  --bg:        #f6f8fc;
  --surface:   #ffffff;
  --surface-2: #f0f4fa;
  --ink:       #0e1b2e;
  --muted:     #56657c;
  --accent:    #16b6cf;   /* quantum teal */
  --accent-2:  #6c7bff;   /* electron violet */
  --accent-3:  #ffb020;   /* warm highlight */
  --border:    #e4eaf2;
  --border-2:  #d4deec;
  --ring:      rgba(22,182,207,.35);
  --shadow-sm: 0 1px 2px rgba(13,30,55,.06), 0 1px 3px rgba(13,30,55,.05);
  --shadow-md: 0 6px 24px rgba(13,30,55,.08);
  --shadow-lg: 0 18px 50px rgba(13,30,55,.16);
  --radius:    16px;
  --radius-sm: 10px;
  --maxw:      1180px;
  --header-h:  68px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-head: "Space Grotesk", var(--font-sans);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }

a { color: var(--navy-3); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--accent); }

h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.2; color: var(--ink); font-weight: 600; }

h1 { font-size: clamp(2rem, 4vw, 3rem); letter-spacing: -.02em; margin: 0 0 .5rem; }
h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); letter-spacing: -.01em; margin: 0 0 1rem; }
h3 { font-size: 1.25rem; margin: 0 0 .6rem; }

p { margin: 0 0 1rem; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.section { padding: 64px 0; }
.section--tight { padding: 40px 0; }
.section[id] { scroll-margin-top: 84px; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-head);
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .5rem;
}

.section-head { max-width: 760px; margin-bottom: 36px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head p { color: var(--muted); font-size: 1.08rem; margin: 0; }

.lead { font-size: 1.15rem; color: var(--muted); }

hr.rule {
  border: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-2), transparent);
  margin: 0;
}

/* ===== Header / nav ====================================================== */

.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.82);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px;
}

.brand { display: flex; align-items: center; gap: 11px; font-family: var(--font-head); font-weight: 700; color: var(--ink); letter-spacing: -.01em; }
.brand:hover { color: var(--ink); }
.mark { width: 36px; height: 36px; flex: none; display: block; }
.brand .mark { color: var(--ink); }
.brand .brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand .brand-text b { font-size: 1.02rem; }
.brand .brand-text span { font-size: .68rem; font-weight: 500; color: var(--muted); letter-spacing: .04em; }

.nav-links { display: flex; align-items: center; gap: 4px; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  display: block; padding: 8px 14px; border-radius: 9px;
  color: var(--ink); font-weight: 500; font-size: .96rem;
}
.nav-links a:hover { background: var(--surface-2); color: var(--ink); }
.nav-links a.active { color: var(--navy-3); background: rgba(22,182,207,.10); }

.nav-cta { display: inline-flex; }

.nav-toggle {
  display: none; border: 1px solid var(--border-2); background: var(--surface);
  width: 42px; height: 42px; border-radius: 10px; cursor: pointer; padding: 0;
  align-items: center; justify-content: center;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; display: block; width: 18px; height: 2px; background: var(--ink); border-radius: 2px; position: relative; transition: .2s ease;
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after  { position: absolute; top: 6px; }
body.nav-open .nav-toggle span { background: transparent; }
body.nav-open .nav-toggle span::before { top: 0; transform: rotate(45deg); }
body.nav-open .nav-toggle span::after  { top: 0; transform: rotate(-45deg); }

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .nav-menu {
    position: fixed; inset: var(--header-h) 0 auto 0;
    background: var(--surface); border-bottom: 1px solid var(--border);
    flex-direction: column; align-items: stretch; gap: 6px;
    padding: 14px 24px 22px; box-shadow: var(--shadow-md);
    transform: translateY(-12px); opacity: 0; pointer-events: none; transition: .2s ease;
  }
  body.nav-open .nav-menu { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav-links a { padding: 12px 14px; font-size: 1.05rem; }
  .nav-cta { margin-top: 8px; }
  .nav-cta .btn { width: 100%; justify-content: center; }
}

.nav-menu { display: flex; align-items: center; gap: 18px; }

/* ===== Buttons =========================================================== */

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-sans); font-weight: 600; font-size: .94rem;
  padding: 10px 18px; border-radius: 10px; cursor: pointer;
  border: 1px solid transparent; transition: transform .12s ease, box-shadow .15s ease, background .15s ease, border-color .15s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--navy); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--navy-3); color: #fff; box-shadow: var(--shadow-md); }
.btn-accent { background: linear-gradient(120deg, var(--accent), var(--accent-2)); color: #fff; }
.btn-accent:hover { color: #fff; box-shadow: 0 8px 24px var(--ring); }
.btn-outline { background: var(--surface); color: var(--ink); border-color: var(--border-2); }
.btn-outline:hover { border-color: var(--accent); color: var(--navy-3); }
.btn-ghost { background: transparent; color: var(--navy-3); padding-left: 6px; padding-right: 6px; }
.btn-ghost:hover { color: var(--accent); }
.btn-sm { padding: 7px 13px; font-size: .85rem; border-radius: 8px; }
.btn .ico { width: 16px; height: 16px; }

/* ===== Hero ============================================================== */

.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(1100px 520px at 80% -10%, rgba(108,123,255,.20), transparent 60%),
    radial-gradient(900px 480px at 8% 8%, rgba(22,182,207,.18), transparent 55%),
    linear-gradient(180deg, var(--navy), #021d3b 60%, #02152c);
  color: #eaf2ff;
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(255,255,255,.10) 1px, transparent 0);
  background-size: 26px 26px; opacity: .35;
}
.hero-inner { position: relative; z-index: 1; padding: 92px 0 84px; max-width: 880px; }
.hero h1 { color: #fff; font-size: clamp(2.3rem, 5vw, 3.6rem); margin-bottom: 1rem; }
.hero h1 .grad { background: linear-gradient(100deg, var(--accent), var(--accent-3)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { color: #c6d6ee; font-size: 1.2rem; max-width: 640px; }
.hero .pill {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.18);
  color: #d8e6ff; padding: 6px 14px; border-radius: 999px; font-size: .82rem;
  font-weight: 600; letter-spacing: .06em; text-transform: uppercase; margin-bottom: 20px;
}
.hero .pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px rgba(22,182,207,.25); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero-stats { display: flex; flex-wrap: wrap; gap: 36px; margin-top: 48px; }
.hero-stats .stat b { font-family: var(--font-head); font-size: 1.9rem; color: #fff; display: block; line-height: 1; }
.hero-stats .stat span { color: #9fb6d6; font-size: .9rem; }

/* page hero (interior pages) */
.page-hero {
  background:
    radial-gradient(800px 360px at 85% -20%, rgba(108,123,255,.20), transparent 60%),
    radial-gradient(700px 300px at 5% 0%, rgba(22,182,207,.16), transparent 55%),
    linear-gradient(180deg, var(--navy), #06203f);
  color: #eaf2ff; position: relative; overflow: hidden;
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero-inner { padding: 64px 0 56px; }
.page-hero h1 { color: #fff; }
.page-hero p { color: #c2d4ee; font-size: 1.1rem; max-width: 720px; margin: 0; }
.page-hero .eyebrow { color: var(--accent-3); }

/* breadcrumb */
.crumbs { font-size: .85rem; color: #9fb6d6; margin-bottom: 14px; display: flex; gap: 8px; flex-wrap: wrap; }
.crumbs a { color: #c2d4ee; }
.crumbs a:hover { color: #fff; }
.crumbs span { color: #6f86a8; }

/* ===== Cards / grids ===================================================== */

.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 980px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow-sm);
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.card.hover:hover, a.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--border-2); }
.card h3 { margin-bottom: .4rem; }
.card p { color: var(--muted); margin: 0; }

/* link card with arrow */
.link-card { display: flex; flex-direction: column; }
.link-card .arrow { margin-top: auto; padding-top: 14px; font-weight: 600; color: var(--navy-3); font-size: .92rem; display: inline-flex; align-items: center; gap: 6px; }
a.card:hover .arrow { color: var(--accent); }
a.card:hover .arrow .chev { transform: translateX(3px); }
.link-card .arrow .chev { transition: transform .15s ease; }

/* lab/team card */
.lab-card .lab-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 14px; }
.lab-card h3 { margin: 0; font-size: 1.12rem; }
.lab-card .badge-site { font-size: .78rem; font-weight: 600; color: var(--accent); display: inline-flex; align-items: center; gap: 5px; }
.people { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.people li { color: var(--ink); padding: 5px 0; border-top: 1px dashed var(--border); font-size: .96rem; }
.people li:first-child { border-top: 0; }
.people li.lead-person { font-weight: 600; }

/* software card */
.soft-card { display: flex; flex-direction: column; height: 100%; }
.soft-card .soft-logo { height: 56px; width: auto; margin-bottom: 14px; object-fit: contain; }
.soft-card h3 { margin-bottom: .35rem; }
.soft-card p { flex: 1; }

/* icon bubble */
.ibubble {
  width: 46px; height: 46px; border-radius: 12px; flex: none;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(22,182,207,.16), rgba(108,123,255,.16));
  color: var(--navy-3); margin-bottom: 14px;
}
.ibubble svg { width: 24px; height: 24px; }

/* ===== Chips / badges ==================================================== */

.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--surface); border: 1px solid var(--border-2); color: var(--ink);
  padding: 7px 14px; border-radius: 999px; font-size: .9rem; font-weight: 500;
}
.chip .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }

.tag {
  display: inline-block; background: rgba(22,182,207,.12); color: var(--navy-3);
  border-radius: 6px; padding: 2px 9px; font-size: .8rem; font-weight: 600;
}

/* ===== Info / detail blocks ============================================= */

.detail-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 760px) { .detail-grid { grid-template-columns: 1fr; } }
.detail {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 18px 20px;
}
.detail .k { font-size: .76rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); margin-bottom: 8px; }
.detail .v { color: var(--ink); }
.detail ul { margin: 0; padding-left: 18px; color: var(--ink); }
.detail ul li { margin: 3px 0; }

.callout {
  display: flex; gap: 14px; align-items: flex-start;
  background: linear-gradient(120deg, rgba(22,182,207,.08), rgba(108,123,255,.07));
  border: 1px solid var(--border-2); border-radius: var(--radius-sm); padding: 16px 18px;
}
.callout .ico { color: var(--accent); flex: none; margin-top: 2px; }
.callout p { margin: 0; color: var(--ink); }
.callout strong { color: var(--ink); }

.prose { max-width: 820px; }
.prose h2 { margin-top: 2.4rem; }
.prose h3 { margin-top: 1.8rem; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin: 6px 0; }
.prose h2:first-child, .prose h3:first-child { margin-top: 0; }

/* lists of links/publications */
.refs { list-style: none; margin: 0; padding: 0; }
.refs li {
  padding: 14px 0; border-top: 1px solid var(--border); color: var(--muted); font-size: .98rem;
}
.refs li:first-child { border-top: 0; }
.refs li strong { color: var(--ink); }

/* ===== Tables / schedules =============================================== */

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-sm); }
table.qm { width: 100%; border-collapse: collapse; background: var(--surface); font-size: .96rem; }
table.qm th, table.qm td { text-align: left; padding: 12px 16px; vertical-align: top; border-top: 1px solid var(--border); }
table.qm thead th { background: var(--surface-2); border-top: 0; font-family: var(--font-head); font-size: .8rem; letter-spacing: .05em; text-transform: uppercase; color: var(--muted); }
table.qm td.time { white-space: nowrap; font-weight: 600; color: var(--navy-3); width: 1%; }
table.qm tr:hover td { background: rgba(22,182,207,.04); }

/* accordion (schedule days) */
.accordion { display: flex; flex-direction: column; gap: 12px; }
.acc-item { border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); overflow: hidden; }
.acc-head {
  width: 100%; text-align: left; background: var(--surface); border: 0; cursor: pointer;
  padding: 16px 20px; font-family: var(--font-head); font-weight: 600; font-size: 1.02rem; color: var(--ink);
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.acc-head:hover { background: var(--surface-2); }
.acc-head .chev { transition: transform .2s ease; color: var(--muted); flex: none; }
.acc-item.open .acc-head .chev { transform: rotate(180deg); }
.acc-item.open .acc-head { color: var(--navy-3); }
.acc-body { display: none; padding: 4px 20px 20px; }
.acc-item.open .acc-body { display: block; }
.acc-body .table-wrap { border: 0; }
.acc-body table.qm th, .acc-body table.qm td { padding: 9px 0; }
.acc-body table.qm td:first-child { padding-right: 18px; }

/* ===== Banner image ===================================================== */

.banner {
  width: 100%; height: clamp(160px, 26vw, 280px); object-fit: cover; object-position: center;
  border-radius: var(--radius); box-shadow: var(--shadow-md);
}

/* ===== Video grid ======================================================= */

.video-grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.video-grid iframe, .video-frame { width: 100%; aspect-ratio: 16/9; border: 0; border-radius: 12px; box-shadow: var(--shadow-sm); }

/* ===== Software detail header =========================================== */

.soft-hero { display: flex; gap: 28px; align-items: center; flex-wrap: wrap; }
.soft-hero .logo-box {
  width: 132px; height: 132px; flex: none; border-radius: 22px; background: #fff;
  border: 1px solid rgba(255,255,255,.25); box-shadow: var(--shadow-md);
  display: flex; align-items: center; justify-content: center; padding: 18px;
}
.soft-hero .logo-box img { max-height: 100%; max-width: 100%; }
.soft-hero .soft-meta { flex: 1; min-width: 260px; }
.soft-hero .soft-meta p { color: #c2d4ee; margin: 0 0 18px; font-size: 1.08rem; }
.soft-hero .actions { display: flex; flex-wrap: wrap; gap: 10px; }

/* people/speaker bios */
.bio { display: grid; grid-template-columns: 220px 1fr; gap: 26px; align-items: start; }
.bio img { border-radius: var(--radius); box-shadow: var(--shadow-sm); width: 100%; }
.bio h3 { margin-top: 0; }
.bio p { color: var(--muted); margin: 0; }
@media (max-width: 620px) { .bio { grid-template-columns: 1fr; max-width: 320px; } }

/* speaker mini card */
.speaker-grid { display: grid; gap: 26px; }
.speaker { padding-top: 26px; border-top: 1px solid var(--border); }
.speaker:first-child { border-top: 0; padding-top: 0; }

/* two-column generic */
.cols-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
@media (max-width: 760px) { .cols-2 { grid-template-columns: 1fr; } }

/* ===== Footer =========================================================== */

.site-footer { background: var(--navy); color: #b9cae3; margin-top: 16px; }
.footer-top { padding: 56px 0 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 36px; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr; gap: 28px; } }
.site-footer h4 { color: #fff; font-size: .82rem; letter-spacing: .12em; text-transform: uppercase; margin: 0 0 14px; }
.site-footer a { color: #b9cae3; }
.site-footer a:hover { color: var(--accent); }
.footer-links { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 9px; font-size: .95rem; }
.footer-about p { color: #93a8c8; font-size: .96rem; max-width: 360px; }
.footer-brand { display: flex; align-items: center; gap: 11px; margin-bottom: 14px; }
.footer-brand b { color: #fff; font-family: var(--font-head); font-size: 1.1rem; }
.footer-brand .mark { width: 32px; height: 32px; color: #fff; }

.sponsors { border-top: 1px solid rgba(255,255,255,.10); padding: 30px 0; }
.sponsors .label { font-size: .78rem; letter-spacing: .1em; text-transform: uppercase; color: #7e95b8; margin-bottom: 18px; text-align: center; }
.sponsors-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 16px 34px; }
.sponsors-row a {
  font-family: var(--font-head); font-weight: 600; font-size: .98rem;
  color: #cdd9ec; letter-spacing: .01em; position: relative; padding-bottom: 2px;
}
.sponsors-row a:hover { color: #fff; }
.sponsors-row a:not(:last-child)::after {
  content: ""; position: absolute; right: -17px; top: 50%; transform: translateY(-50%);
  width: 1px; height: 14px; background: rgba(255,255,255,.18);
}
@media (max-width: 560px) { .sponsors-row a::after { display: none; } }
.sponsors .note { text-align: center; color: #7e95b8; font-size: .85rem; margin: 22px auto 0; max-width: 640px; }
.sponsors .note strong { color: #b9cae3; }

.footer-bottom { border-top: 1px solid rgba(255,255,255,.10); padding: 18px 0; font-size: .85rem; color: #7e95b8; display: flex; flex-wrap: wrap; gap: 8px; justify-content: space-between; }
.footer-bottom a { color: #93a8c8; }

/* ===== Utilities ======================================================== */

.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-2 { margin-top: .75rem; }
.mt-3 { margin-top: 1.25rem; }
.mt-4 { margin-top: 2rem; }
.muted { color: var(--muted); }
.sup { font-size: .65em; vertical-align: super; }
.divider-space { height: 1px; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .hero-inner { padding: 60px 0 56px; }
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1.05rem; }
  .hero-stats { gap: 22px; margin-top: 34px; }
  .hero-stats .stat b { font-size: 1.5rem; }
  .section { padding: 48px 0; }
  .container { padding: 0 18px; }
}

.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}